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At least with Intel drivers, deepcolor visuals may be of BGR format
isntead of RGB like on Nvidia.  Skia recently added support for
30bpp BGR formats [1], so use this new format to support this
configuration.

[1] https://skia.googlesource.com/skia/+/f7eb0544a8853eb087e20a0e5e7bc3597de02074

R=mtklein

Bug: 1016383
Change-Id: I22ffd649f7cfd7c6ed132250dee35c7960210fa6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2052206
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740804}